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<?php
/**
* @author Robin Appelman <icewind@owncloud.com>
*
* @copyright Copyright (c) 2016, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Hooks;
trait EmitterTrait {
/**
* @var (callable[])[] $listeners
*/
protected $listeners = array();
/**
* @param string $scope
* @param string $method
* @param callable $callback
*/
public function listen($scope, $method, callable $callback) {
$eventName = $scope . '::' . $method;
if (!isset($this->listeners[$eventName])) {
$this->listeners[$eventName] = array();
}
if (array_search($callback, $this->listeners[$eventName], true) === false) {
$this->listeners[$eventName][] = $callback;
}
}
/**
* @param string $scope optional
* @param string $method optional
* @param callable $callback optional
*/
public function removeListener($scope = null, $method = null, callable $callback = null) {
$names = array();
$allNames = array_keys($this->listeners);
if ($scope and $method) {
$name = $scope . '::' . $method;
if (isset($this->listeners[$name])) {
$names[] = $name;
}
} elseif ($scope) {
foreach ($allNames as $name) {
$parts = explode('::', $name, 2);
if ($parts[0] == $scope) {
$names[] = $name;
}
}
} elseif ($method) {
foreach ($allNames as $name) {
$parts = explode('::', $name, 2);
if ($parts[1] == $method) {
$names[] = $name;
}
}
} else {
$names = $allNames;
}
foreach ($names as $name) {
if ($callback) {
$index = array_search($callback, $this->listeners[$name], true);
if ($index !== false) {
unset($this->listeners[$name][$index]);
}
} else {
$this->listeners[$name] = array();
}
}
}
/**
* @param string $scope
* @param string $method
* @param array $arguments optional
*/
protected function emit($scope, $method, array $arguments = array()) {
$eventName = $scope . '::' . $method;
if (isset($this->listeners[$eventName])) {
foreach ($this->listeners[$eventName] as $callback) {
call_user_func_array($callback, $arguments);
}
}
}
}
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